Patent US3844299A successfully refreshed from Google Patents.
US3844299A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control circuit for dishwasher
Assignee: Hobart Manfacturing Co
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Filing: 1973-04-05
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Granted: 1974-10-29
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Expires: 1993-04-05
Abstract
Abstract An electrical circuit for controlling various functions in a plurality of dishwashers having common features of a washing chamber containing a quantity of washing solution, a heater element for heating the washing solution, a temperature sensor arranged to respond to the temperature of the solution, a pump for circulating washing solution through a spray head, and an electric motor for driving the pump. The control circuit includes a plurality of circuit boards for controlling the sequence of operation of the dishwasher, overheating protection for the pump motor, and the heater element. Many circuit boards contain indicating lamps in the form of light emitting diodes to indicate proper operation of the circuit. Other circuit boards include optional features, such as automatic initiation of the washing cycle upon the closure of the door.
Inventors
- 👤 S Athey
- 👤 A Vore
- 👤 D Swihart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 14:45
CPC Classifications
A; A47; A47L; A47L15/00; A47L15/42; A47L15/4297; Y; Y10; Y10T; Y10T137/00; Y10T137/6416; Y10T137/6606; Y10T137/8593; Y10T137/85978
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
226 words
In a control system for any one of a plurality of different types of dishwashing machines which have common features of a washing chamber with a tank at its bottom for containing a quantity of washing solution, a heater for heating the solution in said tank, a temperature sensor arranged to respond to the temperature of solution in said tank, a spray head for spraying the solution over soiled articles supported in said washing chamber, a pump connected to circulate solution from said tank through said spray head, an electric motor driving said pump, means responsive to motor overload for interrupting the flow of current to the motor, and means for spraying rinsing solution over the articles after they have been sprayed with the washing solution, the improvement comprising a control circuit board common to all of said different types of machines and having circuit connections to said temperature sensor, said heater, said motor, and said motor overload responsive means, said control board also having terminal connections from said circuit connections corresponding to the different functions to be sensed and/or controlled, and function control boards removably connected to said terminal connections and containing control components responsive to said temperature sensor and said motor overload responsive means and operative to prevent prolonged overload of said motor and to maintain the washing solution within a predetermined temperature range.
Claim 2
Dependent Claim
226 words
In a control system for any one of a plurality of different types of dishwashing machines which have common features of a washing chamber with a tank at its bottom for containing a quantity of washing solution, a heater for heating the solution in said tank, a temperature sensor arranged to respond to the temperature of solution in said tank, a spray head for spraying the solution over soiled articles supported in said washing chamber, a pump connected to circulate solution from said tank through said spray head, an electric motor driving said pump, means responsive to motor overload for interrupting the flow of current to the motor, and means for spraying rinsing solution over the articles after they have been sprayed with the washing solution, the improvement comprising a control circuit board common to all of said different types of machines and having circuit connections to said temperature sensor, said heater, said motor, and said motor overload responsive means, said control board also having terminal connections from said circuit connections corresponding to the different functions to be sensed and/or controlled, and function control boards removably connected to said terminal connections and containing control components responsive to said temperature sensor and said motor overload responsive means and operative to prevent prolonged overload of said motor and to maintain the washing solution within a predetermined temperature range.
Claim 3
Dependent Claim
51 words
In the control system of claim 1, wherein said motor overload responsive means includes temperature responsive means in thermal relation to said motor and circuit means responsive to said motor temperature responsive means for interrupting the flow of electrical current to said motor when motor temperature increases above a predetermined level.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-10-28 | 1978-04-29 | 1978-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-28 | 1982-04-29 | 1982-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-28 | 1986-04-29 | 1986-10-29 | $7700.00 | Window Closed / Lapsed |